airship vs cab

airship

noun
  • A police air unit, a police helicopter 

  • A lighter-than-air aircraft that can be propelled forward through the air as well as steered. 

  • Any aircraft. 

  • A high ranking official of the RAF, viewed as arrogant and distant. 

verb
  • To transport goods by aircraft. 

cab

noun
  • Shelter at the top of an air traffic control tower or fire lookout tower. 

  • Any of several four-wheeled carriages; a cabriolet. 

  • Compartment at the front of a truck or train for the driver. 

  • Synonym of taxi 

  • An arcade cabinet, the unit in which a video game is housed in a gaming arcade. 

  • A former Hebrew unit of volume, about equal to 1.3 L as a dry measure or 1.25 L as a liquid measure. 

verb
  • To travel by taxicab. 

How often have the words airship and cab occurred in a corpus of books? (source: Google Ngram Viewer )